Fig. 1

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Parameters of the ellipse shape describing the wind-ISM interaction regions: R0 (stand-off distance), Rp (the distance perpendicular to R0), and θ (the angle to the apex of the bow shock). The star is assumed to move towards the right relative to the ISM. The black dashed line shows the shape of the wilkinoid for the same stand-off distance (see text for details).
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